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Timestamp Converter

Convert Unix timestamps (seconds or milliseconds) to dates and dates back to timestamps, in UTC and local time.

NETWORK · IN YOUR BROWSER
Leave empty for the current time.

Runs in your browser; nothing you type leaves this page. Too long to share as a link.

HISTORY

Your last 5 runs appear here for 7 days, on this device only.

RESULT

Fill in the form and run the tool; the result appears here.

Timestamp Converter converts between Unix epoch time (seconds or milliseconds), ISO 8601 and a readable date and time in UTC and in your browser's local time zone, in either direction. Up to 10 digits is read as seconds, 11 to 13 as milliseconds; leave the field empty for the current time.

How to read the result

The result shows the same instant in every format side by side, plus a relative description ('3 hours ago') for quick sanity-checking against the current time.

Defender tips

  • Store and log timestamps in UTC everywhere in a system, and only convert to a local time zone at the point of display; mixed time zones in logs are a frequent source of confusion during an incident.
  • Watch for second-versus-millisecond epoch confusion at API boundaries; a value that looks like a date decades away is almost always the wrong unit, not an actual data error.

FAQ

What is the Year 2038 problem?

Signed 32-bit Unix time overflows in January 2038; systems still using a 32-bit signed integer for epoch seconds will wrap to a negative value at that point. 64-bit systems and this tool are unaffected.

Can it handle timestamps before 1970?

Yes, as a negative epoch value, which is valid and represents a date before the Unix epoch.

Does it account for daylight saving time?

The local time uses your browser's time zone rules, including any daylight-saving change for that date. The UTC and ISO 8601 values have no daylight saving. The tool does not convert to other named time zones.